/*
 *  NFCSigning - Open source library for signing/validation of NDEF messages
 *  Copyright (C) 2009-2010 The NFCSigning Team
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */
package org.nfcsigning.algorithm;

/**
 *
 * @author Markus Kilås
 */
public class ImplementationDetector {
    
    private static ImplementationDetector instance;
    
    private boolean useSatsa = true;
    private boolean run = false;
    
    public static ImplementationDetector getInstance() {
        if(instance == null) {
            instance = new ImplementationDetector();
        }
        return instance;
    }
    
    public boolean isSatsaAvailable() {
        
        if(!useSatsa) {
            return false;
        }

        if(!run) {
            try {
                Class.forName("javax.crypto.NoSuchPaddingException");
                useSatsa = true;
            } catch(ClassNotFoundException ex) {
                useSatsa = false;
            }
        }
        return useSatsa;
    }

    public void setUseSatsa(boolean useSatsa) {
        this.useSatsa = useSatsa;
    }
    
}
